脱硫剂粒度对铁水脱硫的影响试验

Investigation on the Effect of Flux Particle Size on Hot Metal Desulphurization

通过不同粒度脱硫剂的铁水脱硫试验,结合实际生产中脱硫渣微观结构的分析,探讨了脱硫剂粒度对铁水脱硫的影响.结果表明,随着脱硫剂粒度的减小,铁水脱硫量、脱硫率和脱硫速率常数均随之增大.脱硫渣结构分为3层：外层主要为脱硫产物CaS,厚度为10～50μm;中间层主要为2CaO·SiO2;内核为未反应的CaO.粒度越小,石灰颗粒利用率越高.为保证较好的脱硫效果和提高利用率,建议将脱硫剂粒度控制为0.5～1.5mm.

Effect of flux particle size on hot metal desulphurization was investigated by hot metal desulphurization experiment using desulphurization flux with various particle sizes. The results indicate that the desulphurization ratio and apparent desulphurization rate constant increases with particle size decrease. The microstructure of desulphurization slag particle was studied by scanning electron microscope. The outer shell is desulphurization production CaS with thickness about 10-50um, the intermediate layer is mainly 2CaO · SiO2, and the core is CaO. The utilization ratio of lime particle increased rapidly with the decrease of particle size. It is suggested that the desulphurization flux particle size should be 0.5-1.5 mm to get better desulphurization effect and higher utilization ratio of the flux.